DOI: https://doi.org/10.9767/bcrec.20366

Enhancement of Charge Transfer in Quantum Dot–sensitized Solar Cell Photoanodes by Supporting rGO Layers

1Faculty of Fundamental Science, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Viet Nam

2Faculty of Basic Sciences, Vinh Long University of Technology Education, Vinh Long City, Viet Nam

3Faculty of Physics and Engineering Physics, VNUHCM-University of Science, Hochiminh City, Viet Nam

4 Vietnam National University Hochiminh City, Hochiminh City, Viet Nam

5 Faculty of Electrical & Electronics Engineering, Vinh Long University of Technology Education, Vinh Long Province, Viet Nam

6 Department of Chemistry, Faculty of Basic Sciences, Can Tho University of Medicine and Pharmacy, Can Tho 94000, Viet Nam

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Received: 10 Mar 2025; Revised: 17 Sep 2025; Accepted: 18 Sep 2025; Available online: 24 Sep 2025; Published: 26 Dec 2025.
Editor(s): Istadi Istadi
Open Access Copyright (c) 2025 by Authors, Published by BCREC Publishing Group
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
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Abstract

In this study, we have studied and fabricated quantum dot sensitized solar cells based on photoanodes with the support of rGO buffer layer to enhance the electron transfer ability from TiO2 nano-semiconductor to FTO substrate. The rGO materials were fabricated by hydrothermal method, then they were coated on FTO substrate by Screen - Printing technique to create rGO nano films. The thickness of rGO films was studied from 1 to 3 layers to evaluate the mobility of charge, reduce recombination and resistance of film. Experimental results were determined by structural properties using XRD, FTIR, EDX and XPS, FESEM spectra; determined optical properties using UV-Vis absorption and transmission spectra; determined optical, electrical and chemical properties using Nyquist and EIS spectra. The maximum measured efficiency was 5.23% for the FTO/rGO(2)/TiO2/QDs film, current density 21.34 mA/cm2, open circuit voltage 5.525V and fill factor of 0.34. These results were also proven through the research results of optical properties, electrochemical properties. In addition, these results are also consistent with the studies of others. Copyright © 2025 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Keywords: rGO nanofilms; quantum dots; solar cells; charge transfer

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Section: Original Research Articles
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